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Note 17 - Shareholders' Equity - Non-vested Options Activity (Details) - € / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-vested options outstanding (in shares)	575,000
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share)	€ 1.47
Non-vested options granted (in shares)	155,000
Non-vested options granted, weighted average grant-date fair value (in EUR per share)	€ 1.93	€ 1.33	€ 1.29
Non-vested options vested (in shares)	(204,400)
Non-vested options vested, weighted average grant-date fair value (in EUR per share)	€ 1.52
Non-vested options forfeited (in shares)	(70,600)
Non-vested options forfeited, weighted average grant-date fair value (in EUR per share)	€ 1.58
Non-vested options outstanding (in shares)	455,000	575,000
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share)	€ 1.58	€ 1.47

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

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X

- Definition

Number of non-vested options forfeited.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of non-vested options forfeited.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

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X

- Definition

Number of options vested.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

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